CN108871307A - The automatic direct-coupling device of Y waveguide chip based on image recognition and optical power feedback - Google Patents
The automatic direct-coupling device of Y waveguide chip based on image recognition and optical power feedback Download PDFInfo
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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Abstract
The present invention is a kind of automatic direct-coupling device of the Y waveguide chip based on image recognition and optical power feedback, belongs to technical field of optical fiber sensing.The present apparatus mainly includes optical path unit, image acquisition units, Motor execution unit and image procossing and control unit.Image acquisition units include right-angle prism, three cameras and three LED；Motor execution unit includes Y waveguide fixed mechanism, motorized stage, control signal, the sextuple motorized stage and motion controller of preceding output end and rear output end posture for setting up camera.Image procossing and control unit are first according to the Image Adjusting input terminal of camera acquisition, the pose of preceding output end and rear output end, the optical power value accurate adjustment Coupling point returned further according to the circulator of light power meter measurement.The invention avoids two fusion points inside optical fibre gyro, simplify optical fibre gyro manufacture craft, reduce the back-reflection and polarization crosstalk of fused fiber splice introducing, improve optical fibre gyro measurement accuracy, service life and quality.
Description
Technical field
The present invention relates to a kind of automatic direct-coupling devices of the Y waveguide chip based on image recognition and optical power feedback, belong to
In technical field of optical fiber sensing.
Background technique
Integrated optics technique originates from the early 1980s, is inspired in integrated circuit, multiple optical fractionations
Device is integrated on the same chip, reduces the volume and weight of system, improves system reliability.By nearly research and development in 30 years,
Integrated optical device has entered the industrialization stage in foreign countries, and representative products have light intensity modulator and the Y wave for optical fibre gyro
Lead integrated optical device.
Fibre optic gyroscope is the angular rate sensor based on Sagnac effect, is the most important achievement of sensory field of optic fibre
One of.Since its is small in size, precision coverage area is big, high reliability, it has also become the important devices in inertial technology, and
And it is widely used in the fields such as various aircraft, naval vessel, positioning and directing and geology, oil exploration.
Currently, optical fibre gyro generallys use wide spectrum light source, Y waveguide chip and polarization-maintaining fiber coil scheme.Its current maturation
Manufacturing technology is：First by Y waveguide chip enter luminous point, it is preceding go out luminous point, afterwards go out luminous point respectively with auxiliary input terminals tail optical fiber, preceding defeated
Outlet, rear output end are coupled.By shining to input terminal injection light in coupling process, monitoring output optical power realizes coupling
Quality-monitoring is closed, after coupling mass, which reaches optical fibre gyro production, to be required, solidifies Coupling point；Then Polarization Maintaining Optical Fiber Fusion Splicer is used
Welding assists tail optical fiber and fiber optic loop.
Problem of the existing technology above-mentioned has：Firstly, when fiber optic loop and auxiliary tail optical fiber welding, since optical path is closed,
Welding quality can not be monitored, cause to assist the fusion point between tail optical fiber and fiber optic loop easily due to end face reflection and polarization
Cross-coupling introduces back-reflection and polarization crosstalk, while introducing splice loss, splice attenuation, causes signal-to-noise ratio to decline, eventually leads to optical fiber top
The precision of spiral shell reduces；Secondly as above-mentioned fusion point junction provides protection and support without hardware configuration for it, junction is easy
It is broken, the service life of optical fibre gyro and quality is caused to be greatly reduced；In addition, in optical fibre gyro manufacturing process above-mentioned there is also
The problem of multiple attended operation is carried out to optical fiber is needed, causes optical fibre gyro production process complicated, increases cost of manufacture.
The Chinese patent application of Publication No. CN 102927979A disclosed a kind of optical fibre gyro on 2 13rd, 2013
And its in manufacturing process on-line checking fiber coupling quality method.Wherein, in order to realize that Y waveguide directly docks coupling with fiber optic loop
It closes, a straight wave guide is each provided with also in Y waveguide chip, positioned at Y waveguide two sides as assistant waveguide, it can be by detecting tail optical fiber
Coupling mass between straight wave guide reacts the coupling mass between Y waveguide and fiber optic loop.But this scheme is asked there are following
Topic：Fiber coupling quality depends critically upon the processing technology of straight wave guide, if there are machining deviation, the coupling matter of straight wave guide for straight wave guide
Amount cannot accurately reflect the coupling mass of fiber optic loop and Y waveguide；The program is not directed to automatic coupling technology, and coupling accuracy is limited to
Manual operation is horizontal, poor reliability.
Summary of the invention
There are production process complexity when in order to solve the problems, such as existing production optical fibre gyro, and further increase optical fibre gyro
Measurement accuracy and optical path reliability, the present invention propose that a kind of Y waveguide chip based on image recognition and optical power feedback is automatically straight
Coupling device is connect, can quick and precisely realize that Y waveguide chip, polarization maintaining optical fibre 6 DOF posture are surveyed in real time using image-recognizing method
Amount, can obtain coupler return light watt level using light power meter feedback method, according to posture information and optical power online
Information adjusts input terminal, preceding output end, rear output end position, realizes and enters luminous point with Y waveguide chip, preceding luminous point out, goes out luminous point afterwards
Accurate coupling.
The automatic direct-coupling device of a kind of Y waveguide chip based on image recognition and optical power feedback provided by the invention,
Including optical path unit, image acquisition units, Motor execution unit and image procossing and control unit.
It include Y waveguide chip to be coupled, input terminal, preceding output end, rear output end and optical fiber in the optical path unit
Ring, and the optical power size that light power meter measurement input terminal returns is set.
The Motor execution unit includes：For fixing the Y waveguide fixed mechanism of Y waveguide chip, left camera is set up
One-dimensional motorized stage sets up the two-dimentional motorized stage of right camera, the three-D electric platform of camera after erection, respectively control signal, preceding defeated
The three sextuple motorized stages and motion controller of outlet and rear output end posture.Motion controller is to one-dimensional motorized stage, two dimension
The sextuple motorized stage of motorized stage, three-D electric platform and three sends attitude control signal.
The motion controller includes programmable logic controller (PLC) and stepping trapezoid program.Motion controller uses timesharing
24 spindle motors of 6 motorized stages are divided into four groups by multiplexing technology, and 6 dimensions of every group of control utilize programmable logic controller (PLC)
6 road pulse interfaces control 6 dimensions.Stepping trapezoid program include instruction reception, instruction understanding, buffer state identification,
Pulse output and the monitoring of pulse output state.
The image acquisition units include right-angle prism, three cameras, three LED and the network switch；Three cameras
Be located at the left side, right side and rear side of Y waveguide chip, and horizontal positioned, be respectively labeled as left camera, right camera and after
Camera；Three LED respectively with shaft axis of optic fibre at 30 degree of deflection oblique illumination input terminals, preceding output end and rear output end；Right angle
Prism is installed on the upper cover bottom surface of Y waveguide fixed mechanism；The network switch is used for three images between camera and desktop computer
Transmission；
The image acquisition units, when opening three LED, left camera acquires the end face of preceding output end and rear output end
Rib image on image, the end face figure like of right camera acquisition input terminal and the luminous point out of Y waveguide chip, is closing three LED, is opening
When red-light source, the preceding luminous point out of right camera acquisition Y waveguide chip and rear dot pattern picture out.The rear camera is in three-D electric
Under the drive of platform, acquisition input terminal, Y waveguide chip, the backsight image of preceding output end and rear output end and anti-by right-angle prism
The top view image penetrated.
The image procossing and control unit includes computer and direct-coupling program.The computer connects three
Camera, light power meter and motion controller.The direct-coupling program includes：Extract Y waveguide chip, input terminal, preceding output
The three-dimensional perspective and three-dimensional position at end and rear output end export the instruction for controlling three sextuple motorized stage movements to motion control
Device；After the posture using the Image Adjusting input terminal of camera acquisition, preceding output end and rear output end, according to the survey of light power meter
Magnitude adjusts input terminal, preceding output end and rear output end and obtains final Coupling point.
The image procossing and control unit completes input terminal, preceding output end, rear output end three by image processing method
It ties up angular adjustment and left-right position is adjusted, upper and lower position and front-rear position are tentatively adjusted；By light power meter output power size, press
According to sequence from front to back, from top to bottom in side length 6um rectangle frame, input terminal, preceding output end are adjusted successively with 50nm step pitch
With rear output end, the position of corresponding input terminal, preceding output end and rear output end when magnitude of power maximum is found, as final
Coupling point.
Compared with the existing technology, the advantages and positive effects of the present invention are：
(1) the automatic direct-coupling device of the Y waveguide chip provided by the invention based on image recognition and optical power feedback, keeps away
Two fusion points inside optical fibre gyro are exempted from, have simplified optical fibre gyro manufacture craft, improve the machine of optical fibre gyro internal optical fiber
Tool performance；Fused fiber splice is avoided to introduce the influence of back-reflection and polarization crosstalk to optical fibre gyro measurement accuracy；Light is improved simultaneously
The service life of fine gyro and quality.
(2) present invention obtains optical fiber and Y waveguide chip six-dimensional pose information, reasonable selection optics using image processing method
Enlarging lens realized that optical fiber and Y waveguide chip precisely aligned so that device has both been able to satisfy measurement accuracy requirement, and had enough
Big measurement range reduces device to the requirement of optical fiber initial installation accuracy.Device uses rear camera overhead view image, backsight image,
Left camera image, four visual angles of right camera image are identified posture, the robustness of device operation are improved using the redundancy of information.
(3) present invention is formed into a loop using two output ends and Y waveguide chip, and light power meter is placed in circulator return terminal
Optical power change is monitored, is solved the problems, such as without monitoring point between Y waveguide chip and fiber optic loop, it can by the optical power value of return
Individually accurately to adjust the front-rear position up and down of input terminal, preceding output end and rear output end, guarantee coupling mass.
(4) present invention installs right-angle prism in Y waveguide chip top cover bottom surface, by camera upper and lower position after adjusting, independently
It chooses whether to select right-angle prism switching camera perspective, realizes the function of camera observation a rearview and top view, reduce
Camera number reduces direct-coupling device volume, reduces costs simultaneously.
(5) present invention uses PLC as motion controller, and electromagnetism interference is strong, so that the operation of device direct-coupling is more
Stablize；It realizes that 24 spindle motors control using six road pulse interface of PLC using time-sharing multiplexing technology, avoids the use of multiple PLC,
Save the volume of direct-coupling device.
Detailed description of the invention
Fig. 1 is that the present invention is based on the automatic direct-coupling devices of the Y waveguide chip of image recognition and optical power feedback integrally to tie
Structure schematic diagram；
Fig. 2 is the stepping trapezoid program flow chart of motion controller in Motor execution unit in the present invention；
Fig. 3 is the schematic diagram of image procossing and image recognition characteristics of image to be extracted in control unit in the present invention；
Fig. 4 is the flow chart of image procossing and extraction of straight line algorithm in control unit in the present invention；
Fig. 5 is the flow chart of image procossing and circular feature extraction algorithm in control unit in the present invention.
In figure：
1- wide spectrum light source；2- red-light source；The first annular device of 3-；The second circulator of 4-；5- input terminal；6-Y waveguide chip；
Output end before 7-；Output end after 8-；9- fiber optic loop；10- right-angle prism；The left camera of 11-；The right camera of 12-；After 13-
Camera；
The first LED of 14-；The 2nd LED of 15-；The 3rd LED of 16-；The sextuple motorized stage of 17- first；The sextuple motorized stage of 18- second；
19- third 6 DOF motorized stage；The one-dimensional motorized stage of 20-；21- two dimension motorized stage；22- three-D electric platform；23-Y waveguide
Fixed mechanism；
24- motion controller；25- desktop computer；26- light power meter；The 27- network switch.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
As shown in Figure 1, a kind of Y waveguide chip provided by the invention and polarization-maintaining fiber coil direct-coupling device, including：Optical path
Unit, image acquisition units, Motor execution unit, image procossing and control unit and man-machine interaction unit.
Optical path unit include wide spectrum light source (SLD) 1, red-light source 2, first annular device 3, the second circulator 4, input terminal 5,
Y waveguide chip 6, preceding output end 7, rear output end 8 and fiber optic loop 9, to implement effective object of the invention.Optical path unit further includes
Light power meter 26.First annular device 3 and the second circulator 4 include circulator input, output end and return terminal.Wide spectrum light source 1
It is connected with first annular 3 input terminal of device, red-light source 2 is connected with first annular 3 return terminal of device, and the application of first annular device 3 can
To realize the online switching of wide spectrum light source 1 and red-light source 2.Second circulator, 4 input terminal connects first annular 3 output end of device,
Output terminates on input terminal 5.Input terminal 5 is the optical fiber pigtail with lithium niobate fritter, and preceding output end 7 and rear output end 8 divide
Not Wei fiber optic loop 9 both ends tail optical fiber, and be bonded on lithium niobate fritter respectively in both ends tail optical fiber.It is defeated the purpose of the present invention is adjusting
Enter the position at end 5, preceding output end 7 and rear output end 8, realize with Y waveguide chip 6 enter luminous point, it is preceding go out luminous point, it is rear go out luminous point
Precision coupling.For apparatus of the present invention in optical path unit, light power meter 26 is connected to 4 return terminal of the second circulator, for measure by
The optical power size that input terminal 5 returns.
Motor execution unit includes the first sextuple motorized stage 17, second sextuple motorized stage 18, third 6 DOF motorized stage 19, one
Tie up motorized stage 20, two-dimentional motorized stage 21, three-D electric platform 22, Y waveguide fixed mechanism 23 and motion controller 24.Y waveguide is solid
Determine mechanism 23 and realize that left camera 11 is focused for fixing Y waveguide chip 6, one-dimensional motorized stage 20, two-dimentional motorized stage 21 realizes right phase
The focusing of machine 12 is translated with X-axis, the three-dimensional position control of camera 13 after three-D electric platform 22 is realized.Pacify in first sextuple motorized stage 17
It fills fiber clamp and clamps input terminal 5, the sextuple posture of control signal 5, installation fiber clamp folder in the second sextuple motorized stage 18
Output end 7 before holding controls the sextuple posture of preceding output end 7, exports after the clamping of installation fiber clamp in third 6 DOF motorized stage 19
End 8, the sextuple posture of output end 8 after control.Motion controller 24 is to one-dimensional motorized stage 20, two-dimentional motorized stage 21, three-D electric
The sextuple motorized stage 18 of sextuple motorized stage 17, second of platform 22, first and 19 these displacement platforms of third 6 DOF motorized stage, send posture control
Signal processed.
Motion controller 24 includes programmable logic controller (PLC) (PLC) and stepping trapezoid program.Stepping trapezoid program includes
Pulse output needed for attitude regulation command reception that image procossing is sent with control unit, displacement platform motion control and pulse are defeated
The feedback to do well.The control of 24 spindle motors is divided into four groups using time-sharing multiplexing technology by motion controller 24, every group of control
The displacement platform adjusted simultaneously is planned to one group according to functional requirement by six dimensions, and first group includes set up left camera one-dimensional
The three-D electric platform 22 of camera after motorized stage 20, the two-dimentional motorized stage 21 for setting up right camera, erection；Second group is control signal
The sextuple motorized stage 17 of the first of 5 postures；Third group is the second sextuple motorized stage 18 of output end 7 before controlling；4th group is control
The third 6 DOF motorized stage 19 of output end 8 afterwards.And the use of time-sharing multiplexing technology is effectively reduced to motion controller 24
The demand of pulse output interface effectively reduces the volume of motion controller 24.Stepping trapezoid program include instruction reception,
Understanding, buffer state identification, pulse output and the monitoring of pulse output state of instruction.As shown in Fig. 2, PLC is initialized first
Command reception is arranged command reception buffer area, and allows to receive；It receives deposit after one group of instruction to receive in buffer area, from connecing
It receives and reads one group of instruction in buffer area, understand instruction, output respective numbers pulse control corresponds to displacement platform movement, and monitoring pulse is defeated
It does well, after the completion of output, continues to read next group of instruction from buffer area is received.When receive buffer area it is full after, PLC is to calculating
Machine 25 sends signal, and pause data are sent.
Image acquisition units include right-angle prism 10, left camera 11, right camera 12, rear camera 13, the first LED (luminous two
Pole pipe) the 14, the 2nd LED 15, the 3rd LED16 and the network switch 27.The network switch 27 is used for extended network interface, realizes
Image transmitting between left camera 11, right camera 12, rear camera 13 and desktop computer 25.Left camera 11 and right camera 12 are using high
Resolution ratio CCD (charge-coupled device) camera extracts 5 end face of input terminal, 8 end face of 7 end face of preceding output end and rear output end.Phase afterwards
Machine 13 uses high-resolution resolution ratio CMOS (complementary metal oxide semiconductor) camera.It is solid that right-angle prism 10 is installed on Y waveguide
Determine the upper cover bottom surface of mechanism 23.First LED14 with shaft axis of optic fibre at 30 degree of angular direction oblique illumination input terminals 5, the 2nd LED15 with
With shaft axis of optic fibre at output end 7 before 30 degree of angular direction oblique illuminations, the 3rd LED16 with shaft axis of optic fibre at 30 degree of angular direction oblique illuminations
Output end 8 afterwards.Open three LED14,15,16, left camera 11 acquires the end face figure like of preceding output end 7 and rear output end 8, acquisition
Obtain before output end 7 left view, image as shown in the magnification region in Fig. 3, and obtain after output end 8 left view.It is right
Camera 12 acquires 5 end face figure like of input terminal, obtains rib image on the right view of input terminal 5 and the luminous point out of Y waveguide chip.It closes
Three LED14,15,16, red-light source 2 is opened, right camera 12 acquires the preceding luminous point out of Y waveguide chip 6, goes out dot pattern picture afterwards.
13 automatic light source of camera afterwards is not required to addition additional light source.Camera 13 above moves to suitable height under the drive of three-D electric platform 22 afterwards
Degree, while adjusting 22 another two dimension of three-D electric platform, input terminal 5 that acquisition is reflected by right-angle prism 10, Y waveguide chip 6, preceding
The top view image of output end 7, rear output end 8 moves down rear camera 13 to proper height, while adjusting 22 another two of three-D displacement platform
Dimension acquires the backsight image of input terminal 5, Y waveguide chip 6, preceding output end 7, rear output end 8.
Image procossing and control unit include the direct-coupling program on desktop computer 25 and computer 25.According to coupling
State sends signal to control motion controller 24, realizes to one-dimensional motorized stage 20, two-dimentional motorized stage 21, three-D electric platform 22,
The control of the first sextuple motorized stage 18 of sextuple motorized stage 17, second and third 6 DOF motorized stage 19.Desktop computer 25 connects
Three cameras 11,12,13, light power meter 26 and motion controller 24.Direct-coupling program includes：Extract Y waveguide chip, input
It holds, the three-dimensional perspective information programme of preceding output end and rear output end, three-dimensional perspective is pitch angle, deflection angle and the angle of polarization；Extract Y
The three dimensional local information program of waveguide chip, input terminal, preceding output end and rear output end；The sextuple motorized stage fortune of output control three
Dynamic instruction is exported to motion controller；Utilizing the Image Adjusting input terminal of camera acquisition, preceding output end and rear output end
After posture, input terminal, preceding output end and rear output end front and back, upper and lower position are accurately adjusted according to the measured value of light power meter and obtained
Final Coupling point.
Desktop computer 25 acquires left camera 11, right camera 12,13 image information of rear camera, identifies to characteristics of image, such as
Shown in Fig. 3, direct-coupling program is executed.5 end face fiber core of image recognition input terminal, polarization axle and the Y acquired using right camera 12
6 angle of polarization of waveguide chip, after the completion of angle of polarization identification, 17 spin fiber of sextuple motorized stage of control first reduces input terminal 5 and polarizes
The differential seat angle of 6 angle of polarization of angle and Y waveguide chip.The image acquired using left camera 11,7 end face fiber core coordinate of output end before identifying
And the angle of polarization, and rear 8 end face fiber core coordinate of output end and the angle of polarization, after the completion of angle of polarization identification, in conjunction with the identification of right camera 12
Y waveguide chip polarize angle information, by the second sextuple motorized stage 18 or 19 spin fiber of third 6 DOF motorized stage, output before reducing
The differential seat angle of the angle of polarization of end 7 and Y waveguide chip 6, the differential seat angle of the angle of polarization of output end 8 and Y waveguide chip 6 after reduction.Benefit
The image recognition acquired with rear camera 13 enters to hold upper angularity, enters angularity on luminous point, enters end side angularity and enter luminous point incline
Angle, according to the beat of obtained differential seat angle control signal 5 and pitching.Similarly, the image recognition acquired using rear camera 13
Angularity in preceding outlet goes out angularity on luminous point, preceding outlet incline angle and luminous point incline angle out, according to obtained differential seat angle
The beat of output end 7 and pitching before adjusting.Using angularity in outlet after the image recognition of rear camera 13 acquisition, go out rib on luminous point
Angle, rear outlet incline angle and luminous point incline angle out according to the beat of output end 8 after obtained differential seat angle adjustment and are bowed
It faces upward.Entering for image recognition Y waveguide chip 6 using the acquisition of rear camera 13 and enters apex coordinate on luminous point incline at luminous point coordinate, comprehensive
Conjunction obtains Y waveguide chip and enters luminous point three-dimensional coordinate information, resolves input terminal coupling according to rib, 5 incline of input terminal on input terminal 5
Point, and the 5 fibre core information of input terminal of right camera 12 acquisition is combined, obtain 5 Coupling point three-dimensional coordinate of input terminal, calculating and Y waveguide
Chip 6 enters luminous point three-dimensional position deviation, to adjust 5 D translation of input terminal.After the completion of input terminal 5 adjusts, red-light source is opened
2, by rib on right camera 12 observation Y waveguide chip light-emitting point, goes out luminous point before acquiring Y waveguide chip 6 and go out dot pattern picture afterwards, according to
Image information go out before determining luminous point and it is rear go out luminous point up and down, front-rear position, luminous point is gone out by rear camera 13 acquisition Y waveguide chip 6
Upper rib, it is comprehensive to obtain going out luminous point before Y waveguide chip 6, go out luminous point three-dimensional coordinate afterwards；According to rib, incline on preceding output end 7, resolve
Preceding output end Coupling point, and the 7 fibre core information of preceding output end of left camera 11 acquisition is combined, 7 Coupling point of output end is three-dimensional before obtaining
Coordinate goes out luminous point three-dimensional position deviation before calculating and Y waveguide chip 6,7 D translation of output end before thus adjusting.Similarly adjust
8 three-D displacement of output end afterwards.
The input terminal 5 of above-mentioned image recognition offer, preceding output end 7, the upper and lower of 8 Coupling point of rear output end, front and rear coordinate essence
Degree is not able to satisfy direct-coupling required precision, and apparatus of the present invention carry out accurate adjustment according further to 26 light intensity magnitude of light power meter.It beats
Wide spectrum light source 1 is opened, by the upper and lower, preceding of 26 output power size accurate adjustment input terminal 5 of light power meter, preceding output end 7 and rear output end 8
Position afterwards.According to from front to back, sequence from top to bottom successively adjusts input terminal in side length 6um rectangle frame with 50nm step pitch
5, preceding output end 7 and rear output end 8, while record 26 watt level of light power meter is counted by desktop computer 25, find magnitude of power
The location information of corresponding input terminal 5, preceding output end 7 and rear output end 8 when maximum, by input terminal 5, preceding output end 7 and rear defeated
Outlet 8 moves at maximum power, solidifies Coupling point, and automatic direct-coupling process terminates.
Input terminal 5, preceding output end 7, rear output end 8 and the Y wave of the acquisition of rear camera 13 are utilized in above-mentioned direct-coupling program
Lead 6 top view of chip, rearview, and angularity, incline angle on thus obtained input terminal 5, preceding output end 7 and rear output end 8
Degree, three-dimensional coordinate and Y waveguide chip 6 enter angularity on luminous point, enter luminous point incline angle, go out angularity on luminous point, go out luminous point side
The extraction of 6 angle of polarization of angularity and Y waveguide chip, is substantially linear feature identification, and coordinate therein extracts actual extracting
Straight-line intersection.The identification of input terminal 5, preceding output end 7,8 three-dimensional coordinate of rear output end and polarization angle is substantially circular feature knowledge
Not.
There is following feature for above-mentioned extraction of straight line input picture：There are straight lines, two straight lines for piece image
Or a plurality of straight line different situations；There are when a plurality of straight line, relative bearing is fixed；Straight line angle varies less, but linear position
It changes greatly.In order to improve the robustness of device, adaptive sliding window method is used in direct-coupling program of the present invention, such as Fig. 4 institute
Show, specially：The initial value of window size Yu sliding window step pitch is set, and sliding window, cutting obtains subgraph, with Candy operator
Subgraph edge is extracted, using interative least square method fitting a straight line equation, the straight line for meeting angle qualifications just can be defeated
Out, if expected straight line cannot be found in the cycle-index of restriction, change window size and sliding window step pitch, re-search for straight line.
The present invention uses sliding window method to extraction of straight line according to characteristics of image, optimizes straight line using the least square method of iterative fitting
Edge realizes more realization targets, high-precision extraction in image.
For the feature that above-mentioned fiber end face picture noise is larger, the present invention is calculated using the random loop truss of strong interference immunity
Method extracts fibre core coordinate and two panda eye profiles.As shown in figure 5, computer 25 reads in a frame image of camera acquisition, first
Using Canny operator extraction image border, 4 points are then randomly selected from edge image, utilize wherein 3 point construction circles
Shape verifies the 4th point whether in 3 circles constructed, if not resampling if；If verifying remaining edge point
In on construction circle the number put construct round for true circle if the number of point meets qualifications, otherwise resample.
After detecting 3 circles in image, using the center of circle of the maximum circle of radius as fibre core coordinate, the line of centres of two roundlets is as inclined
Shake angle.The present invention extracts fiber core coordinate and the angle of polarization using random loop truss algorithm, anti-compared to traditional Hough transform dry
It disturbs strong.
Then, man-machine interaction unit includes desktop computer 25 and user interface, and interface receives operator's keyboard, mouse
The input of mark event, controls the operational sequence of direct-coupling device, real-time display camera image and optical power size, realizes to Y wave
The control and coupling mass for leading the automatic direct-coupling device of chip are monitored on-line.
Claims (9)
1. a kind of automatic direct-coupling device of Y waveguide chip based on image recognition and optical power feedback, which is characterized in that including
Optical path unit, image acquisition units, Motor execution unit and image procossing and control unit；
Including Y waveguide chip to be coupled, input terminal, preceding output end, rear output end and fiber optic loop in the optical path unit, and
The optical power size that light power meter measurement input terminal returns is set；
The Motor execution unit includes：For fixing the Y waveguide fixed mechanism of Y waveguide chip, the one-dimensional of left camera is set up
Motorized stage sets up the two-dimentional motorized stage of right camera, the three-D electric platform of camera after erection, respectively control signal, preceding output end
With the three sextuple motorized stages and motion controller of rear output end posture；Motion controller is electronic to one-dimensional motorized stage, two dimension
The sextuple motorized stage of platform, three-D electric platform and three sends attitude control signal；
The image acquisition units include right-angle prism, three cameras, three Light-emitting diode LED and the network switch；Three
A camera is located at the left side, right side and rear side of Y waveguide chip, and horizontal positioned, is respectively labeled as left camera, right phase
Machine and rear camera；Three LED respectively with shaft axis of optic fibre at 30 degree of deflection oblique illumination input terminals, preceding output end and rear output
End；Right-angle prism is installed on the upper cover bottom surface of Y waveguide fixed mechanism；The network switch for three cameras and desktop computer it
Between image transmitting；
The image procossing and control unit includes computer and direct-coupling program；The computer connects three phases
Machine, light power meter and motion controller；The direct-coupling program includes：Extract Y waveguide chip, input terminal, preceding output end
With the three-dimensional perspective and three-dimensional position of rear output end, the instruction for controlling three sextuple motorized stage movements is exported to motion control
Device；After the posture using the Image Adjusting input terminal of camera acquisition, preceding output end and rear output end, according to the survey of light power meter
Magnitude adjusts input terminal, preceding output end and rear output end and obtains final Coupling point.
2. the automatic direct-coupling device of Y waveguide chip according to claim 1, which is characterized in that the optical path unit
Including wide spectrum light source, red-light source, first annular device, the second circulator, input terminal, Y waveguide chip, preceding output end, rear output
End, fiber optic loop and light power meter；Wide spectrum light source is connected with the input terminal of first annular device, and red-light source is returned with first annular device
End is gone back to be connected；The input terminal of second circulator connects the output end of first annular device, and input terminal is connected to the defeated of the second circulator
Outlet；Light power meter is connected to the return terminal of the second circulator.
3. the automatic direct-coupling device of Y waveguide chip according to claim 1, which is characterized in that the motion control
Device includes programmable logic controller (PLC) and stepping trapezoid program；Motion controller uses time-sharing multiplexing technology, by 6 motorized stages
24 spindle motors are divided into four groups, and 6 dimensions of every group of control control 6 dimensions using 6 road pulse interfaces of programmable logic controller (PLC)
Degree；Stepping trapezoid program includes the reception of instruction, the understanding of instruction, buffer state identification, pulse output and pulse output shape
State monitoring.
4. the automatic direct-coupling device of Y waveguide chip according to claim 1, which is characterized in that the Image Acquisition
Unit, when opening three LED, left camera acquires the end face figure like of preceding output end and rear output end, and right camera acquires input terminal
End face figure like and Y waveguide chip go out rib image on luminous point, closing three LED, when opening red-light source, right camera acquisition
The preceding luminous point out of Y waveguide chip and rear dot pattern picture out；The rear camera is under the drive of three-D electric platform, acquisition input
End, the backsight image of Y waveguide chip, preceding output end and rear output end and the top view image by right-angle prism reflection.
5. the automatic direct-coupling device of Y waveguide chip according to claim 1 or 4, which is characterized in that at the image
Reason and the direct-coupling program in control unit, Image Adjusting input terminal, preceding output end and the rear output end acquired using camera
Posture, specifically include：
Image recognition input terminal end face fiber core, polarization axle and the Y waveguide chip angle of polarization acquired using right camera, control clamping are defeated
Enter the sextuple motorized stage spin fiber at end, reduces the differential seat angle of the input terminal angle of polarization and the Y waveguide chip angle of polarization；
Utilize output end end face fiber core coordinate and the angle of polarization before the image recognition of left camera acquisition, and rear output end end face fiber core
Coordinate and the angle of polarization, the Y waveguide chip identified in conjunction with right camera polarize angle information, and control clamps preceding output end or rear output end
Sextuple motorized stage spin fiber, the differential seat angle of the angle of polarization of output end and Y waveguide chip before reducing, output end and Y wave after reduction
Lead the differential seat angle of the angle of polarization of chip；
Enter to hold upper angularity using the image recognition of rear camera acquisition, enter angularity on luminous point, enter end side angularity and enter luminous point
Incline angle adjusts beat and the pitching of input terminal；Utilize angularity, out luminous point in outlet before the image recognition of rear camera acquisition
Upper angularity, preceding outlet incline angle and luminous point incline angle out, the beat of output end and pitching before adjusting；It is adopted using rear camera
Angularity in outlet after the image recognition of collection goes out angularity on luminous point, rear outlet incline angle and luminous point incline angle out, adjustment
The beat of output end and pitching afterwards；
Enter luminous point coordinate using the image recognition Y waveguide chip that rear camera acquires and enter apex coordinate on luminous point incline, obtains Y wave
It leads chip and enters luminous point three-dimensional coordinate, according to rib, incline on input terminal, resolve input terminal Coupling point, acquired in conjunction with right camera defeated
Enter to hold fibre core information, obtain the three-dimensional coordinate of input terminal Coupling point, calculates and Y waveguide chip enters light spot position deviation, with adjustment
Input terminal D translation；
After the completion of input terminal adjustment, red-light source is opened, go out luminous point before acquiring Y waveguide chip by right camera and goes out dot pattern afterwards
Picture, go out before being determined according to image luminous point and it is rear go out luminous point up and down, front-rear position, Y waveguide chip light-emitting point is acquired by rear camera
Upper rib, the comprehensive three-dimensional coordinate for obtaining going out luminous point before Y waveguide chip, going out luminous point afterwards；According to rib, incline on preceding output end, resolve
Preceding output end Coupling point, and the preceding output end fibre core information of left camera acquisition is combined, the three-dimensional of output end Coupling point is sat before obtaining
Mark goes out luminous point three-dimensional position deviation before calculating and Y waveguide chip, output end D translation before adjusting；Similarly, output end after adjustment
Three-D displacement.
6. the automatic direct-coupling device of Y waveguide chip according to claim 5, which is characterized in that the direct-coupling
Program, upper angularity, incline angle, three-dimensional coordinate and the Y waveguide chip for extracting input terminal, preceding output end and rear output end enter light
Angularity, the angle of polarization enter luminous point incline angle, go out angularity on luminous point, going out luminous point incline angle and Y waveguide chip on point,
It is using extraction of straight line method；The extraction of straight line method utilizes the minimum of iteration using adaptive sliding window method
Square law fitting a straight line equation.
7. the automatic direct-coupling device of Y waveguide chip according to claim 5, which is characterized in that the direct-coupling
Program extracts the three-dimensional coordinate and polarization angle of input terminal, preceding output end, rear output end, is using circular feature extracting method；
The circular feature extracting method is random loop truss algorithm.
8. the automatic direct-coupling device of Y waveguide chip according to claim 1, which is characterized in that the computer root
It is walked according to light power meter output power size according to sequence from front to back, from top to bottom in side length 6um rectangle frame with 50nm
Away from input terminal, preceding output end and rear output end is successively adjusted, find corresponding input terminal when magnitude of power maximum, preceding output end and
The position of output end afterwards, as final Coupling point.
9. the automatic direct-coupling device of Y waveguide chip according to claim 1, which is characterized in that the device also wraps
Man-machine interaction unit is included, for the operational sequence of user's control direct-coupling device, real-time display camera image and optical power are big
It is small, coupling mass is monitored on-line.
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